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Often dry years come in sequences of 2 or 3 years at a time • separated by 2 to 4 years of normal to above normal precipitation. Other years tend to vary around the mean. Very dry years occur about every 10 to 12 years. From the records it can be assumed that the next 2 to 3 years will be normal or above normal in precipitation but after then will decline to a minimum in about 5 or 6 years. During the next 2 to 3 years it can be assumed precipitation will be between 14.0 and 17.5 inches per year. These projections, however, must be understood to be extrapolations and may not hold strictly true. The probability, however, is high this pattern will be observed. Therefore, the next 5 years will probably be reasonably favorable for revegetation, but after that moisture stress will severly impact established vegetation. The foregoing strictly applies only to Colorado 3p rings. The r . Snyder Quarry itself differs to some degree. Temperatures are probably about 1°F lower in the annual average and precipitation is probably 2 1/2 to 3 1/2 inches higher due to the heavy influence from the frequent springtime upslope winds, the proximity of Pikes Peak to the quarry, and somewhat more abundant thunderstorms in the summer tha~i occurs in the City. wind could potentially have severe effects on thy: quarry area, but local topography aids greatly in reducing this impact. The quarry rests in a sort of elongated bowl with higher ridges all a:_ound except for the SE side where parts of the quarry can be seen from areas of nearby towns. This topography serves to reduce the impact velocity of high velocity winds from all directions except the SE, the direction where strong winds are least likely to occur. This topography, however, ~. does create local turbulence effects that can lift dust, swirl it about, and eventually introduce some of it into the main wind flow. Effects of S-K-3